Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 620
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	623
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	22,265
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	22,225
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	26,715
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	26,644
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	26,450
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	26,258
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	76,050
Available-for-sale Securities, Debt Maturities, Single Maturity Date	75,750
Available-for-sale Debt Securities, Amortized Cost Basis	145,568	$ 146,097
Securities, available-for-sale	143,833	144,028
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	489
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	497
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,335
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	3,355
Held-to-maturity Securities	3,824	4,024
Held-to-maturity Securities, Fair Value	3,852	$ 4,048
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	69,518
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 68,083